Both my CosmosEx are listed as "Unknown" on the "DHCP Clients List". Would be cool to have possibility to define that name.

Ok i had checked now, the linux distro used by CE rpi doesn't uses dhcpclient, it uses udhcpc... so you got to edit this file by adding the green lines :/etc/network/interfaces# The loopback network interfaceauto loiface lo inet loopback

And then your device should now appears as "cosmosex" in your DHCP server list. Please note that the first hostname directive is given for the wired connection and the second hostname for the wireless one.